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單項選擇題

The following command is executed to create the baseline template:  
SQL> EXECUTEDBMS_WORKLOAD_REPOSITORY.CREATE_BASELINE_TEMPLATE(START_TIME=> TO_TIESTAMP(SYSDATE+2), 
END_TIME=>TO_TIMESTAMP(SYSDATE+10), BASELINE_NAME=>’Mybase4’, 
TEMPLATE_NAME=>’Mytemp4’, EXPIRATION=>NULL);  
Which statement is true about the effect of the above command?()  

A. It creates a baseline template that never expires.
B. It produces an error because no snapshot information is provided to create the baseline.
C. It creates a baseline template that expires after the Automatic Workload Repository (AWR) retention period.
D. It creates a repeating baseline template that repeats after the Automatic Workload Repository (AWR) retention period.

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